Just thought I'd post my impressions, as a Frequency/Amplitude player who got to play quite a bit of Blitz at PAX this weekend.
The gameplay is excellent. I was skeptical that the 2-lane track format would provide a challenge, but it's actually just as fun, if not more so, than the previous Freq/RBU games. The "track unlock" gameplay is completely replaced with the "track leveling" gameplay, which is probably the most significant change for any HMX game in a while -- missing a single note is not nearly as disastrous for your score as in any previous Freq or GH/RB game, and it seems like there's some interesting strategy in choosing whether to level tracks versus playing a track with more notes. It also removes the need to do split-second track movements like in Freq/Amp, which I think makes it considerably more fun.
The control options are pretty good. I mostly used the strangely-named "Freakish" setting, where you move with a stick/dpad, and hit notes with the shoulder bumpers/triggers. This makes it easy to hit quick double notes on either lane, by using both a trigger and bumper. I do think it would be nice if the final game had completely customizable controls, like Freq/Amp had.
Four little things that annoyed me, posed as questions both to other people who played (to see who else noticed them) and to HMX people (if any info can be given about them):
- Occasionally, the twisty note track will go over a hill in the road. This makes it very hard to read upcoming notes for a few seconds.
- When I had to move way across the board, like from drums (far left) to keys (far right), the display kind of choked up a bit, like it lagged for a second because I switched tracks too fast.
- Perhaps this is an option that I missed or that will be added in the final game, but I didn't see an option to wrap around the tracks (i.e. pressing "move left" when on drums to wrap around to keys).
- During an instrument solo, since the non-solo tracks don't have any notes, I think it makes sense to just auto-move to the track that has the solo. But, perhaps this could be an issue when two instruments have simultaneous solos. Anyway, just a minor thing.