Needs some tweaks
The game concept is great, but the execution could use some work. The music is good (the voices are annoying though...) and I love the Touhou-esque enemy attack patterns, lots of bullets and sometimes quick moving enemies. Gives it a good challenge.
First of all, leveling. Since large combos get you to level faster it makes it easy to level a few characters but it is incredibly difficult to level some characters. If you gained experience at the end of the fight based on how much damage you dealt that would help, it would still make it a bit harder for slow characters but it would be a little more fair.
Combining: A good concept again, but having only one character that can initiate the support and only being able to combine with the other two originals makes it harder to pull off, and half the time the larger size only succeeds in making you a big target so you can die easier.
Heroes for Hire: Good that we can buy more fighters to help, but a few of them are tough to use. So far only maxamillion and Zero have proven useful for me. *Note to anyone who reads this, Maxamillion is like a shotgun, just put him on top of the enemy and he can deal big damage and avoid most enemy attacks.
Some enemies, such as Stardust, have attack patterns that are impossible to completely dodge. This isn't so bad, but if you're using a slow character you're subject to a lot of hits and are almost guaranteed to die. One way to remedy this would be to let someone decide to use an ability to get rid of enemy bullets rather than use their special to attack.
The rules could use some fixing too. They can make it more strategic, but can give you a major disadvantage. The worst of these is the silence rule. It makes you have to dodge for 60 seconds and you get no reward? I understand having you dodge, but there needs to be something you're given for doing so, otherwise it's just a waste of 60 seconds and your hp.
Overall it's a good concept and wasn't a bad play, but some of the gameplay elements make it overly difficult to play the game and are just plain annoying. I'm hoping for a sequel to this with the problems I mentioned fixed and some more work put into it.