So as I was playing Yooka-Laylee, I made a mental list of things I wished were different to improve the (already great!) game. And as that list grew, I decided to type it down in a text file, which I added to as I thought of more (and which I'll probably continue adding to when I replay the game). So here's my list:
Small Improvements:In Kartos sections, your final gem count stays on screen until you retry or exit, instead of disappearing as soon as you’ve passed into the finish hoop. Because it’s hard to concentrate on your score while you’ve got your eyes on the track avoiding obstacles, so if you forget to look at your score just as you pass the finish hoop, you don’t get to see how many you’ve collected to help you determine how much better you need to do next time.
The Yooka-Laylee faces on the power/health bar changing depending on how much health you have left (like in Banjo-Kazooie - extremely happy faces when you have full health, and the faces get progressively sadder as you lose health).
Add the Yooka-Laylee rap into the game (eg. have it autoplay if the player leaves the title page sitting idle for too long).
Stop the camera fighting to take control while trying to steer the characters in Flappy Flight mode. I chose “manual” camera mode, so I’d still like proper control of it while flying.
In Rextro's mini games for World 4 and World 5, add some indication of how far along the track you are. Because those games are frustratingly hard especially at first, and this frustration is exacerbated by the fact that you have no idea when (if?!?

) the level will ever end.
Make Yooka's standard tongue disappear whenever he uses a move where he sticks his tongue out, so he doesn't have a double tongue.
This is a tiny one, but in the golf game in World 5, the character at the counter insulted Laylee’s nose and I was expecting Laylee to reply with a savage come-back, but she said nothing which seemed really out of character for her.
EDITED TO ADD:
In a menu (such as when selecting Vendi tonics, or browsing Trowser's list of moves for sale), make the currently selected text/line more obvious (such as a much different colour or greater contrast, or make the text jiggle, or put an arrow next to it or something to make it clearer which item you have selected) because it was often very hard to see which menu item you were currently on.
Large Improvements:More “meeting interesting characters with interesting problems for you to solve” challenges put into the game, and less “press button, start time limit, go through hoops” challenges. [As already discussed more in-depth earlier in this thread].
Game over sequence showing the consequences of failing if you save and exit the game before beating Capital B (eg. Tooty getting transformed in Banjo-Kazooie). [As discussed more in-depth here: ].
Make Dr. Quack’s quizzes more fun - more of the “Where is this picture from?” or “Whose voice is this?” questions and less of the “How many Quills/Pagies did you collect in World…?” sort of questions (because it’s tedious having to “study” and memorise the Totals screens for each level before going into one of these quizzes).
Either up the limit of Pagies and Quills you need to unlock things, or give some extra reward (yes I know there were achievements unlocked for collecting them all, but I mean a useful in-game reward) for people who collect a high number to spend their remaining Quills and Pagies on (such as using your extremely high Note Score unlocking the final note door in Banjo-Kazooie just before facing Gruntilda, where you used your final 4 Jiggies to unlock double health bar). Unless you have plans for the extra Quills and Pagies in the upcoming DLC?
