Not Far From a Good Game
Having a time limit on a game like this takes it from logistical puzzle solver to OMGWTFBBQ. Instead of encouraging actual thought, it forces you to spam your brain and put together random gizmos that make you want to put a bullet in your head. If that was the intention, you succeed. But just know that only a handful of people will actually enjoy that.
That being said, the puzzles are great and the physics of the thing seems to work out nicely. The game would've benefited from a checkpoint system. SFX are good. The look is clean. Very nice on that end of things.
So I would suggest a patch if possible, adding on the things that yetyay listed.