If you can, I'd recommend trying with a controller. Control schemes were designed with very Metroid-like controls in mind (Along with a smidge of Megaman). The jungle zone, is indeed the last zone that we made, included in the demo a bit late.
For the wall to wall attack of the worm, the dust particles will actually tell you where he will attack from, in which order
It was a conscious decision to try to stay away from that concept of 'dying' to an enemy to have a scene trigger. Instead, we have the power punch system along with medium enemies. Rest assured that there will be more medium enemies as the game continues development.
If you feel like doing so, I'd really appreciate if you edit your review to represent your feeling of the game as a whole, be it good or bad