Around 1 hour 27 minutes to beat , as shown in this unedited playthrough of the default Easy difficulty. Not a good game. Very awkward , delayed control but easy enough to beat. Will go through any other ports of the game I find too, maybe the PS1 version soon. The ship has momentum which means it doesnt stop right away, so your ship is constantly floating and delayed.
Since I rarely ever kept any power ups I had to fight bosses for a very long time, with a pea shooter, so that made things more challenging and tedious. I only used a few continues , though it seems you have 9. For games with limited continues I usually leave the runs unedited since there is that chance of failing the entire run. Though I think 89 lives might have been enough.
The only unique thing about this shooter was the ability to jump over enemies and bullets. I thought that was a cool twist on the formula but the rest of the game was poorly executed. Even the final boss can be completely exploited by staying just out of range for both forms.