This game is very very nice, animations and visuals are very stylish and coherent, music and sounds feel very good too, and game mechanics are very nice as well (I loved the homages to jetpack joyride in the "rides") :D
It's clear you're 3 talented developers from the polish and care behind all the components of the game (visuals, audio, gameplay), kudos on the theme!
A couple of suggestions and tweaks I think could help you if you want to expand the game:
- According to the tutorial, the "expanded" fish version should move slower (horizontally), but it doesn't really feel like so... I ended up playing all the runs with the expanded version to take half damage and it didn't really make a difference compared to the smaller fish version, so I think there might be some bug or something not having loaded properly perhaps? If that's not the case and the speeds are how the fishes are actually supposed to move, then I'd suggest to make the bigger fish version even slower, as it doesn't really help now to switch to the smaller fisth version in my opinion;
- Speed up the "level up" items descriptions appearance, or maybe make it appear instantly (even thoguh the text appearing letter by letter, with the souds, feel very nice);
- I'd suggest going for a landscape mode where your fish slides horizontally rather than vertically: I know the horizontal slide makes your game more unique with respect to the thousands horizontal-movement endless runner that exist, but the horizontal layout sure lets you see more obstacles on screen at the same time and react faster, especially considering that your fish is already pretty much elevated from the bottom of the screen already.
Please note these are just tweaks and adjustments only relevant if we want to get very picky, the game is already amazing as it is, could be a very nice mobile game in my opinion (would need some adjustments on how the "hover" mechanic to see items descriptions work, but the mobile version of the game is already pretty much developed as of now basically).
Excited to see what you do with the game next, keep me posted, good job on the amazing game :D