A very interesting game! I put like 15-20 minutes in it non-stop, which is a notable amount of time for me playing a jam submission.

I think what would help this game is music.

Overall, a very good submission. I had a lot of fun. By the way, I suppose you were inspired by numerous .io games out there, weren't you?

Nice try with the AI.
The game can be harder than it seems ! The shop upgrade might be a little bit complicated though.
Maybe adding a music would be nice too :)

Level 56, arena 15.
The game has a good potential, but could need a bit more polish.
Bullet distance is the clear advantage maker in the game (then reload speed)
The only real danger I had in the game was enemies spawning on my tank in an arena.
Either I missed something or there was much a "breaking the rules" theme.

In the end it's well done game that with some little tweak could be made really fun.
Keep up the good work.

Really challenging but fun with all the upgrades!! Nice work! :D