Awesome!
Loved this game! Will be even more awesome when it is completed / has more chapters!! I quite liked the menu art too.
The difficulty is perfect - quite challenging, but doesn't feel impossible: hint to those having difficulty: don't stand still, pick a weapon & max it, on each level find somewhere high up you can double jump between (think of it as the high ground with an escape route...). I got to level 4 with maxed revolvers before really needing anything heavier, and still think they beat most of the other unmaxxed weapons (lol - but I hate slow fire rate/reload weapons!) To be fair I did finish (fail?) using a fully upgraded rail gun (boom! headshot!) and didn't try all the weapons fully upgraded. LOL! I just noticed there is a difficulty setting on the title screen!
For those of you keen for a storyline: I think there is the beginning of storyline, but because the game abruptly ends when you reach level 7, there is only enough exposition to hint at a much richer back-story.
More game!!
(Please.)