I was stuck on 3-6 for a bit. Those flower stages really do complicate things. One attempt in particular, using stage select to start on 3-1 and going through, I made it all the way there clean. No lives lost, 5 bombs, max speed, 2 range (which is optimal IMO, more on that later), and I still lost, haha. At that point I almost just reset, continuing has you in such a bad spot as far as powerups are concerned, that it can really feel impossible. I pushed through though, and thankfully the boss after wasn't really bad. Now I'm on level 4. Only done a couple attempts so far, ran out of time on 4-3, but I think i sorta figured out a method for next time.
So for the most part, I consider range upgrades actively bad for you, past 1 extra range. It becomes incredibly hard to manage things when your explosions are really big, even on just normal (non flower) stages. It's really easy to hit yourself when you're trying to dodge enemies. That's part of what makes continuing so punishing, continuing gives you 2 bombs and 3 range. I think it would go a very long way reversing those numbers. 3 bombs and 2 range would be better. Especially with the zombie enemies on level 4. Having more bombs seems to be the way to deal with those, since they can't kick them if you place 2 in a row. My 4-3 strategy for my next attempt will basically be to just do 2x2 bomb clusters to block off the pathways completely. Admittedly, having 3+ range would be pretty helpful for that stage, because of the long straightaways, but I'd probably still stay at 2 for fear of 4-6, which I suspect will be another flower stage. (If the level pattern holds.)
I really am liking the game in general. Though, it has given me a decent amount of frustration. There are a lot of neat things you've done with it. In particular the enemy variety is really impressive. Each enemy is very unique mechanically and they definitely present a good challenge. (Though, maybe a little too much challenge in some spots, haha.) I liked the beetle objective. It's an interesting little twist on the "don't hit stuff" format of the flower stages.
I really dislike the way the vore functions in the game, and for a different reason than you'd think. It's not the content itself. (Though I do have an opinion about vore below.) It's that when a vore enemy decides to do it's animation, that's the last animation you can get to see on that attempt because she's just gone afterward. It doesn't spit her out. I don't really get the appeal of vore. If it's "soft vore", like a thing swallows the girl and maybe there's some tentacles or like an "in dick" inside the creature that fucks her for a bit before spitting her out, that seems good to me. But just like, eating a girl, just don't see the appeal. Would much rather see the girl get spit out afterwards, covered in saliva.