Nice game! I loved the interpretation of the theme and the fact that expanding is required to survive, but also becomes a problem if you expand too much! Nice catchy music scores too (thought it's not clear from the game and descriptions/comments which elements were assets and which were created by you).
A couple of suggestions if you plan on expanding the game:
- Obviously, add a purpose to the coins you collect, since right now they don't serve any purpose, they don't even influence your score for the leaderboards: maybe add a shop for some snowball customizations and cosmetics, music customizations, powerups? consumables to make your runs easier, ecc...
- Adjust the size of UI elements based on the game window size (Use Screen.width and Screen.height in Unity to get those): in the main menu, on small windows, buttons and other UI elements like the logo overlap;
- Make sure you make obstacles appear NOT in fixed rows and locations on the screen, but also randomly, and at the borders of the area in which your snowball can roll: if you place your snowball on the far left or far right in fact, you can basically avoid all obstacles in front of you because none spawn in those positions;
- I'd suggest you to add ramps in which your snowball can jump and avoid obstacles in the air, which may be cool, and maybe add more obstacles variety, like trees or similar
Fun arcade game overall, needs some polish on the graphics and some variety in gameplay, but the main elements for a fun game are already there, good job :D