Fun game, I like the role reversal from the classic snake ahaha, and I love the instrument played yourself! I tried recording my kalimba but couldn't get the sound quality nice enough like you've seemed to!
I won't reiterate stuff other people have mentioned, but here are a few quick and easy tips to polish a game very quickly:
- Use a consistent color scheme - I’m terrible at picking out colors, so I use a color scheme generator when I need a new one, like https://coolors.co/e9d758-297373-ff8552-e6e6e6-39393a. If you don’t like the colors you can just reroll them, or lock some of them in and just reroll the ones you don’t like
- Pick a fun font - There are lots of default fonts installed, but if you don’t like any of them, you can pick out a custom one from a site like https://www.dafont.com/ (just make sure the license permits whatever use you intend it for), download it, drag it into your Unity Assets folder, and it’s ready to go! It’s actually kind crazy what a different font can make; getting one that matches the vibe you’re going for can completely change feel of the game!
- If you're working in Unity, add lots of particles! Don't go overboard and flood the screen with them. My philosophy is that almost every action and event should have a reserved, appropriate particle effect, but even just adding a bit here and there can have a surprising difference in making a game feel more polished. This can be the most time-consuming to implement of these tips, but there are also very simple ways to implement them that don't even require code. Examples: have any moving elements leave a trail of particles; have important buttons, characters, or items radiate particles; create particle effects that go off when an item/character is spawned in