The hit detection on the sword (at least sword 1)is terrible, and considering that that's going to be the weapon players are going to be using when they form their first opinions on this game, that is a major issue. I found myself absolutely hating this game until I decided to try the hammer. Yes, it helps to jump just as your swinging the sword, but you shouldn't have to tell players to play a certain way in order to being hindered by broken elements of the game.
A lot of potential, but the difficulty curve is god awful, up until level 6, it's virtually impossible to die, then, out of nowhere, we're expected to navigate a room littered with spikes with very little room for error, break a room full of boxes, being careful enough not to break so many boxes that boxes in the middle of the room don't become inaccessible, then navigate back through the spikes again, this time trying to wall jump around wall mounted spikes. It's simply unreasonable. The play concept of avoiding spikes needs to be introduced in a more gradual manner.
I kind of get a "Shadow of the Colossus" vibe, from the prominent ideas of isolation and exploration for it's own sake, but there also seems to be something of a Lovecraftian slant to the whole thing. I like it.
I like what you have so far, but I do see one potential gameplay issue, the way in which the enemies automatically move away from you when you're firing mean you can just fire continuously and survive forever. I'd suggest having variations in enemy reactions, like maybe have the yellow and green avoid fire, but have the red essentially act as mindless berserkers, to throw the player off, fix the possible exploit and create gameplay variety
I like the art and animation. The biggest annoyance to me isn't the lack of content, but the continued defilement of the term "emo". If you don't get what I mean, look up Rites of Spring and Moss Icon.
if the actual cascade was a little faster, and there was a mode in which the timer was actually connected to your performance, this could be a great puzzle game.
fun, a bit short, I don't have a problem with the use of the ctrl key so much as the up key, maybe if you just used two letter keys to place each of the two block varieties .
 "ESCAPE"){kind=icon}
 "Cursed Treasure: Level Pack!"){kind=icon}
 "Ninja Rampage"){kind=icon}
 "Dungeon Rush!"){kind=icon}
 "UpBot Goes Up"){kind=icon}
 "Splitter Pals"){kind=icon}
 "Bear in the dungeon"){kind=icon}
 "Looming"){kind=icon}
 "Pato"){kind=icon}
 "Loved"){kind=icon}
 "Emo Kid Plays Guitar Hero"){kind=icon}
 "Posy Teens - Vivian's Cute Pets"){kind=icon}
 "Evolution Demo"){kind=icon}
 "Game - College Project"){kind=icon}
 "Crossfire"){kind=icon}
 "Back To the Light"){kind=icon}
 "Cascade"){kind=icon}
 "Platform madness 1.0"){kind=icon}
 "Earthquake"){kind=icon}