the overall game is good, and the art seems great, I only noticed a few areas you can improve on, and I will discuss that here :)
First, There isn’t any reaction on buying a potion from the inventory, you can add anything, it can be a small particle emission when clicked, and a small sound, to make the player realise that he did buy it, else the inventory seems off
Second, change the attack button from ‘E’ to the left mouse click, it will be easier, as in this one rn, I found it difficult to keep pressing e as well as try to run and jump, so making it the left mouse button will help that become more efficient
Thirdly, There isn’t any challenge really in the game, every wave, we have to fight same enemies, and then the hp keeps improving instead of decreasing, try adding more different enemies, with different attack styles,so the player is uncertain when their health can detoriate, and also, don’t provide player with so much points after every wave, else it’s very easy to increase the health easily
try this things out and the game will become more great and fun to play :”))
Yours friendly Me