It's nice to see someone making an effort in trying to make a unique game, though, much of the concepts are based on tetris. Instead of looking at a game & thinking what you could do differently with it, try to find ideas completely different to what other people have been doing.
About the game though, the different shapes makes the game unique in it's own little way. There are a few problems with your design, however. In the triangle version, there are some cases (As a matter of fact, half of them) where it's impossible for me to open up any empty spaces, due to how the 'lines' are designed. This makes things frustrating when the player makes mistakes. Try to refine the way 'lines' are destroyed. Secondly, the octagon designs makes it so much harder since half of the pieces don't fit with each other, except for themselves. Some speed modifications would add a nice touch.
Try not to restrict yourself to just puzzle or 'linear level' based games. I look forward to your next game. =P
D: Gah.. It looks as though most of my previous comment has been cut out for no apparent reason. What I meant to say was this: "...There were times when the controls were completely unresponsive. I'm not sure it was the game or my computer. It also seems to try to hard to be a Raiden look-alike, but there were some original aspects of it that seperates it from that. The shield powerup was perhaps my favourite. All-in-all, it's a good game..."
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