A truly excellent game! I love how you managed to incorporate gameplay mechanics from the newer Doom games, such as the Glory Kills, to an otherwise gloriously retro-styled first-person shooter with an absolutely adorable colourful and whimsical presentation.
My only gripe is that the Hub system right now feels kind of pointless, since we are not even allowed to revisit completed levels for missed secrets and supplies.
That aside, if the finished product is at least as good as the demo, then you can be sure I will purchase it on release!