Transfusion is a great game! One of the best DB games i have played. I got up to about level 13, after only missing a couple of levels. Here's what i think:
Pros:
* I like the music
* Great graphics and textures
* It is a bit hard when you start, but eventually you get used to it and its really fun!
* The bosses are cool, they could be a bit more varied though
* I like the idea of having a fork at the end of each level, makes it a little less linear
Cons/bugs:
* The fading on the menu is annoying
* At the screen where you enter your name for the high score list, if you keep pressing down it goes off the screen (i.e. if you press down 10 times you have to press up 10 times to get back)
* The spikes are sometimes on the wrong side of the wall
* I too got stuck outside the tunnel at one point: perhaps you should change it so that the ship and the camera automatically follow the curve of the tunnel so you dont have to hit the wall to go around
* The bullets are a little hard to see, perhaps you could make them brighter
* It's not very obvious when you lose a life, it should play a death animation, but not stop
Overall, its a fantastic game. Now if you will excuse me, im off to see if i can get past level 13.
[edit] Okay, i got up to the end of level 14, and got stuck outside again. I had full health with 3 lives left, 7 bursts and almost full red ammo. At the rate i was going, i could've reached level 80. Oh well.
Current project: Parking Lot (puzzle game, 30% complete)