Hi... I downloaded both .capx files for this (the one in the first post and the one on page 2). It seems like the bug when you slide left is still there, sadly. Also there seems to be some major glitching when you get to the boss door, you may want to play with that a little. Also you said you added a charge shot, but I see no sign of one. Are you sure you updated with the version you intended to upload?
edit: I noticed something else. In the .capx, the mettaurs duck under their helmets when they get close to you, but in the play in browser link version, they don't.
Overall, this doesn't seem very polished... yet. I know you said you are new to construct, and it does show. but I would advise you not to give up. I saw a few good megaman engines for MMF and Game Maker but for construct this was all I could find, so I am really hoping you will continue to work on this! :)