I liked your game a lot. You're aware of the door bug so here's a bit of feedback on other things: jump, in some scenes I can jump higher than in others, that should be a flat value imo. I reached the big cube and killed him, but when I went across the door it seemed to reload the same scene (not sure) so he killed me in the end. Also he pushes me and is not being repelled by my attack, don't know if that's a bug or intentional, can understand not being repelled, but being pushed is a bit hard on the player.

My feedback after playing:

Nice graphics.

You never explain the controls, which led to me never figuring out how to attack until after taking some time to experiment after beating the game. I don't understand the control scheme. Move with arrow keys, jump with space, attack with... mouse? Would I need three hands to play? I only realized later still that you can also move with A and D. The control scheme could have used a little more thought. Generally, it's better to avoid using both mouse and keyboard if you don't need to aim or such, and to consider a variety of players. Offering both the arrow keys and WASD is good, but the jump button doesn't account for it. Think having the attack button on the keyboard somewhere near jump would have worked better.

The music is... very dissonant.

Still, a fairly solid game over all. I didn't see much in the way of bugs, which was good, though the large robots did seem to react oddly to running into a platform.