Awesome game! Absolutely loved playing this and would definitely pay for a full game.
The visuals were great and the game had a very Mario-esque feeling to it that made it fun to play, right down to the dying at the same point and raging at it nature that Mario games bring out.
The only improvement I can think of is possibly the spacing of the spikes at certain points of the levels as they make it slightly more difficult than it necessarily needs to be for the player to pass. Additionally, something that could up the interaction with the player could be the incorporation of a lives system or health so that when they encounter the humans they are more wary and alert so that they don't die.
However, this game was amazing. You guys did a fantastic job.