Seemed well put together (although I didn't at first realise there was a double jump, and was cursing how accurate the jumps needed to be on the first screen!) but then... I couldn't work out what to do next. Walls with circular holes in may be some sort of door, perhaps? But I couldn't open it if so; "interact" didn't do anything, and I don't understand what the hub was for. The game seems well implemented and the shooting sound effect is nice, so I suspect the fault here is with me, but it does suggest that maybe some more helpful design might be useful?

Great stuff.  Very slick and polished. The main character animation is just fantastic.