I've tried and tried, but I don't like any Thunder Force games
I kinda like the art in Thunder Force 4.
But I don't like how any of them play. memorizing which guys to kill or let go, when to dodge X bullet, when to switch weapons, change speeds, zoom forward/back...
I watched the demos for TF3. Like 50-60% of the enemies were dodged. I should have watched that first. Totally not my style. I wouldn't have bothered playing too long.
I'm not that impressed with the art in 2 or 3, either. I prefer more depth to art in general. Things are just kinda flat and R-Type-ish.
HOWEVER.
I applaud anyone who can finish even a level in these games.
I was impressed with myself the first time I lased about a minute before game over.
I cannot twitch that fast...