Thanks for playing, a repeated response is that people didn't figure out the slime splits if you keep damaging him (1, 2, 4, 8) and only at the last stage it affects the HP bar, I'll tune that.
did you discover holding a direction and attacking does left/right attack? I want to let the player experiment and find out the game mechanics, but if many players miss that, I'll have to rethink my design.