First, the game clearly went overboard with the trap screen. It's by far the hardest screen of the game, since some triggers require some tight maneauvering, and that to not mention the needle jumps (Doing a diamond every time you fall at a new trap, plus a lot of weird triggers. That's not healthy at all). And there are still quite a few screens after that. The difficulty curve is more than just a bit messed up here.
Also, at the chase screen, you can easily skip the trigger that increases the speed of the chase, along with a lot of jumps that should be included there.
There's also the troll portal screen, where the trigger to activate the next portal is way too small. When you make a troll portal, the trigger to show the next portal should be at the same point where the portal is, and fill the whole sprite of the portal, otherwise people might not touch the trigger by accident, and simply think of it as a glitch and leave.
The Alt saves should also be mentioned. It's alright to change the key used to save, but did it really have to be Alt? It's one of the most annoying keys to think of, and it's highly likely that people might press another key by mistake, think that they saved the game, and then, a few seconds later, realize that they didn't (Probably through the worst way).
The game also ends too suddenly (The last screen didn't really feel like a last challenge).
I didn't really have much fun with this game (Mainly due to the trap segment), but I'll acknowledge it as a well-designed game, with just a couple flaws. The music isn't really catchy to me, but the visuals are nice.
If you think you can handle the trap segment without a mental breakdown, I think I would recommend this game.