I fixed some problems and added some monsters.
Can't get the finishing to work... :\

neither can I, lol

Nice map, and so vicious also ( yes i had experienced "the platform falling scenario" ... ).

Any ideas on how I can make the game better? :3

Yeah one suggestion, i don't know if this do the same when you play it.
But the player seems to appear inside the central pillar at the begining, making him loosing one heart.
If you can move the player spawn point, like on the top of the pillar, this should resolve this issue.

And another idea, adding one or two laser beam alien too had more challenge :D