This is really fun! I like the gameplay loop of grinding the shapes for exp and avoiding the higher-level players. Some things I'd like to see:

- Dying and losing exp (and levels) feels overly brutal. Losing ~10 levels a death makes me dejected to re-grind.

- The level scaling might be better logarithmic so the initial levels make it super clear as to the benefit the upgrade has.

- Up to level 5 there should be a "noob flag" where you can't damage or be damaged by other players. This can be toggled off and is only on until the first time you reach level 6.