Randorama wrote:
At any case, It is pretty clear that the fourth stage is the real goldmine of the game, i think that something like 1B is doable (The final boss alone allows for , i think, at least 10 slashes in the 30M range). I still have to see the final boss, though

Hmm. I'd say 2B+ overall scores will likely turn up as the tops soon in Japan (unless they have already, I can't find this info anywhere!). I think that's probably the limit of the game. Maybe 2.5 billion if there is some underlying, semi-secret, advanced multiplier-raising technique we've all been missing. I don't know what bonuses you get for spare lives or spare bombs (if any).
1B on Stage 4 is probably about right. The problem is maxing out the multiplier to 60+ at key sections and getting through the big enemies in subsequent sections without a chain slash (which kills your multiplier and your score), and rather using regular bullet slashes and pure firepower.
Easier said than done, but I found a way to do it on LV3 Hard (granted I die in the process 50% of the time

) so LV4 should just be a slightly more difficult, natural extension of the process.
On my high score I missed 40 mil I usually get in Stage 3 via stupid mistakes (I normally end Stage 3 with ~740 mil, but on this run it was 695 mil). So 1.2 billion is foreseeable for me quite soon. A more finely tuned Stage 4 score (I'm getting close) + a 1CC would lead myself to a potential 1.3~1.4 billion score, based on my current strats.