tl;dr: Good
I thought that, as a whole, the game was solid. However, I found the level design a bit straightforward (the one level which required thinking, the one with the moving platform where you had to jump at the right time, even had a sign explaining what to do). I also thought that the parts where you had a few switches and one/two would result in immediate death were frustrating and unnecessary (a bit Deus ex Machina imo). Despite this, I think that the core of the game was interesting and hope that in the future you make a level pack so that we can fully enjoy your hard work.
Just a couple more things (sorry ^^)... It would be nice for a game like this to have secrets or bonus levels or something hidden within a level (some platforms were only there to prevent you flying too far, but there could have been something on one of them for us to try to get through), and also perhaps a boss? There were many weapons but nothing to use them on other than basic minions.
I know I'm being a bit critical, but I think that this game is worth a sequel and so am giving you all the advice I can think of extempore.