Oh man, I love the idea behind it. I'm learning javascript on my own right now, so it was pretty funny. Still took me a long time to understand what the heck all the loop [walk right] things meant aka to AVOID what was in it. Haha I should have realized it would loop every time you tried that.
The difficulty curve was too much for me, but I've never been good with platformers. I got stuck on the level with the three moving platforms. - Why doesn't your guy on top of a platform move with the platform? He just stays suspended on air - never seen that before in a platform game, and it feels weird. Is there any chance for when you die to NOT have to repeat the previous loops again, and just start on the one you died on? That was incredibly frustrating to me, and why I quit early. Yes, I can jump on the platforms in the first stage, but I need more practice jumping on them without hitting a on the 3rd!
It's a great concept, and I'm so glad you made it. I look forward to seeing what you do in the future!