I really like the graphics, the game looks very nice. Still I think there are many things to do. Jumping (especially when jumping against walls) feels sometime a bit weird. Also the robots are sometimes very inactive and easy to kill. What's very annoying is, that you need to reload the game when you die. Overall a good start, but stills some work to do.

Hey great start. I think an important thing to remember for a jam is that people will be trying your game for the first time whereas you have had the whole time playing it and you know what is coming. A safe first area lets the player get a handle on the keys and what the movement feels like. If you had a restart then the player can iterate more quickly rather than needing to refresh the page. I am pointing this out because you have put a lot of work into the later parts but players can bounce off quickly if it starts off too hard.

I cannot restart the game.

This is a good start. The jump is way too slow, but it is exploitable, resulting in a giga jump. The enemies are fast but it's easy to find their weaknesses. The tunnel under the map is a bit narrow and the player can stuck in it, but at least not permanently. The props are nice to have, some pick ups, and destructible/movable boxes, weapons etc would make them even better. The boss looks cool, and with the tunnel it's killable at least.

After I destroyed every robot and explored the whole map with the super jump I missed only a nice victory scene.

It feels  very raw. It'd be nice to add some sound in the game. 

Also,  the   main character  dies very quick and there's no restart button, so  one has to reload a page, which is frustrating