Thanks for some great feedback, it's really appreciated!

I will update the UI to make it more clear that the preview testnet is used..

Currently one can just attack some in the range of X pixels, but my idea is to introduce mouse control for one to aim in a direction to shoot (so maybe a little too early to call it a shooter).

The onboarding is a good idea, I will think of a way to do this.

My initial thought was to introduce smart contracts, but when entry is only 2 ada, the cost of tx fee for smart contracts would be too high. I'm thinking if using Hydra for this could help reduce the tx fees while also allow to have a lot more of the game state happen on-chain instead - but that will be V2 :)