So glad to have stumbled upon this one!! I can't believe it's getting so little attention! Some of our team have been playing with the idea of using the "Lost Vikings" mechanics for a while! Love what you've done with this one! I'm still going through it ( I agree that a way to skip completed levels would be great, but had too much fun so far, so I don't mind replaying some), but so far I like everything about it a lot!! But the one thing that's struck me is how intuitive the level design is. How cleverly the different abilities are presented. This can be quite hard sometimes, and i think you've nailed it!
The "E" key didn't seem to respond sometimes, but that's most likely my keyboard. Such a cool game!!