I enjoy the game a lot, and I've unlocked about %95 of the gallery, but I'd like to suggest some addendums for future updates
1. Create a function to transfer save data between game updates. I wouldn't want to restart from the beginning with achievements and unlocks if you come out with a new major update
2. Add a "one-handed" mode. The up arrow key would shoot and the down arrow key would use GP
3. Some disabled people may be physically incapable of playing the game good enough to unlock much of the content. The cheats do not solve this as they disable achievements and unlocks. Add one more cheat that "allows unlocks and achievements to be earned even with cheats on". This could have a pop-up saying it's Ill-advised to use unless you're really bad at the game
4. You've likely already thought of this already, as it's mostly a technical issue, but allow shifting sugar to use any of the power-ups that other characters may use so that she's more interesting to play as. Also, in lieu of adding voice lines, make her facial expressions more exaggerated than any other character
5. This is purely cosmetic, but maybe add an Easter egg where clicking the character on the main menu will cause them to inflate/get fatter, and doing so again will pop them, allowing a different character to show up on the main menu screen