Yea the crates end the enemies are not there cause they fall off the ground at the start of the level XD I noticed the music too i'll fix it as soon as possibile but can't reaupload it for now cause of the jam limitation, so if it happens again i would suggest to reload the page. Also buttons "level 1" and "level 2" incorrectly bring you to tutorial1 and tutorial2, if you want to try them out you should proably use tutorial3.
I played a bit more and one thing I noticed is that the placement of some of your recharge packs is hurting the player when you try to reach it. Picking up this recharge pack makes no sense because it gives you one more charge for the hook but to reach it I need at least 2 hooks. One hook to reach it, then one to get off of the cliff again which means I lost 1 charge just by trying to recharge. Maybe something like this would work better if this charge would give me more recharges. The risk to reach is high but the reward is really helping.
Another little thing: When using the hook like when you try to reach a platform, the charge should not be used if you don't hit anything. It happened quite often to me that I misjudged distances and wasted a charge by not hitting anything. Technical it makes sense to use the charge because you use the hook but it would be less punishing if in this case the charge would not be used.
I think that is enough feedback now :)