[[[Developer of the game here]]]
there's a bug in the game where it freezes if the player attacks very fast, some ways to work around the bug: 1. try pause / unpause the game multiple times
2. you play jump directly to the games levels by holding LEFT CTRL + RIGHT CTRL + [1. 2 or 3], for example, jumping to level 2 => hold LEFT CTRL and RIGHT CTRL and click 2 on the keyboard (not the numpad)