Nice little platformer ^^. The controls are enjoyable, and I like the concept! At first, I thought "okay, you just visually replaced buttons by doors, that's a bit lazy", but then I enjoyed the hiding mechanics and the "splitting" sections, it gave more meaning to the theme =).
The graphics are good, even if I feel like the story you are telling us is very different than the game I'm playing... My guy doesn't look like a ninja, and this place doesn't look like a temple ^^'. The music is very enjoyable and fits your universe perfectly, great job on that!
You already know about the size of the spikes, but you also need to change some colors ^^. A very basic way to avoid player misunderstanding is to use the red color for all the "bad" things. I would have loved a little red-ish tint on the camera's vision cone and the spikes, to make things more clear ^^.
The level design is nice, but I would have loved some checkpoints, or shorter levels ^^'. There is a lot of "walking for nothing", which is a bit frustrating.
So overall, that's a really nice entry ^^. It's a little bit rough around the edges, which is normal for a 7-days jam game, but I enjoyed paying it, so congratulations =)!