I liked it. The deteriorating environment, the Mario style platforming and the radioactive goo trails were all really neat effects. I would have to agree with others that upgrades and power ups would benefit this game a lot, but this is only demo and I enjoyed the game and story. I look forward to seeing what other elements, levels, enemies and bosses you decide to add. Keep up the great work :)
Thanks for playing! Upgrades and power ups are in the works for a future release (: I'm glad you enjoyed it and thank you very much for the feedback!