Hey I liked this game very much. You mentioned that the backtracking was tedious and I understand you had very limited time to make this, but here are some suggestions anyway:
The laser enemy: make it have a laser that doesn't hurt at first, that's transparent and becomes wider and wider for 2 seconds, make it so that it can't follow the player (the turret can either aim, prepare to shoot, or shoot)
That would make the gameplay more interesting.
For backtracking, if robots respawned (or only activated) after picking up an item, it would make coming back more fun. Atlernatively, being able to teleport (only yourself but not parts) at different places would have worked very well, similar to a check point system.
The enemy bullets are probably slow enough, but in tight spaces maybe making them even slower would have been alright
Overall good game and I played with a controller (gamepad) by the way. Thanks for putting that option in.