The randomized keys comes from the thought of could it be interesting to have everyone's controls be different and the player has to learn and discover them. Where two players couldn't just say here's the route and use q->e->w to solve it. You still have the oh use bomb->this->that, but the player has to discover the buttons themselves. We really just wanted to see what that would be like and experiment a little.
Clicking on keys would be problematic with how it's currently implemented since most things spawn at the cursor, but we could have made it work, and wouldn't be a bad idea to have. Thanks for playing!