sorry to hear, but I would love for you to be able to play the game, so let me provide some help:
- enemies come at you when hit
- it could be that because of framerate etc. that you are not able to see the eraser projectiles. try to aim and click at the pixels anyway and see if anything happens
- if not, could you try another browser and make sure you are on the latest versions?
- if its still not working: there are windows and linux binaries attacked on the game site. please try them out
- if you are on mac, I could provide a mac export, but I am unable to test it
I would be very happy if this resolves your issue!