Happy to hear about the version number display. That's good news. Thanks!
And thank you very much for replying after taking the time to read my feedback, idea's, & suggestions. Very kind of you ^_^
I'll admit first thing and foremost, Cave Dragons were a bit far fetched for this game. Besides, they can be difficult to draw and animate anyways. I can see that. No worries there. That will makes things easier in the long run. Good call. If you can draw and animate dragons well though, all the more power to you. I sure as hell can't lol. And I LOVE Dragons... 😥
As for the worms: Fair enough. It was just an idea.
As for the acid: Whoops, My bad, I did know it was acid (pretty sure I saw something in game say as much...) which is why I mentioned slimes because they tend to dissolve cloths (uwu) and get into things (O_O)... That's the best thing about slimes, they can be made out of anything & squeeze into anywhere... "I don't know why the hell I called it water, typing too fast I guess 😖." Anyway... I'll correct that obviously. My bad. Nice catch. Thank you.
The news about slimes getting scrapped for now is a bummer though. It would have been a nice addition "if" you could've made it work, annd I hate to admit it buut I do have a little bit of a slime fetish on the side. "We all have our things... uwu." I can't imagine it would have been the worst animations I've ever seen that was passible... Speaking of which, Ever play a game called "Space Escape"? 
Fun short little flash game, not the best animations or art. Still, fun though. Not bad. Similar in comparison to a degree but
I feel you're art is better already, and that game was practically finished...
"As for the slimes: Oh well -_- I'm just one person and you can't please everyone though. That's life." Thanks for the update. Thanks for at least considering adding them. Thanks anyway. Enough said, moving on.
As for the teleportation device... YES!, very futuristic, sounds very useful & very cool. That's kind of exciting. Such a device would definitely come in handy especially for those "sticky" situations within the depths of the mines. That is certainly going to be a late game changer. No more long return journey's from the bottom of the mine after end game to the top ^_^. Hurray! I'm for it. I can't wait. Implement it wisely...
As for levels 15 & 21: I'm interested to see what you do with them in the future & come up with.
I was just speaking my mind. I didn't expect... I mean... that was... thanks. 🙂
Don't forget, you can always keep scrapped levels as "bonus levels" for whatever purpose. You know, kind of like easter egg levels/ Crazy levels... You did put work into them after all. Might as well use them for something right?
Heey, there's an idea... what if one of the pitfall traps lead to the old level 15 setting the player back or forward... 😈 Anyway...
The only other things that I failed to mention in the previous feedback that might be helpful are:
- If there was some sort of shop or supply cache on the surface to re-supply. If you run out of supplies within the mines but are able to make it back to the surface to resupply. Or perhaps because the player forgot to use the upgrade store between levels or was just short of purchasing something... You know what I mean.
- I hate to admit or even mention it, but skeletons should also respawn after a short time like the zombies as they are magical creatures being held together by an unknown means or necromancy. Isn't that the usual common sense story?.
In general, certain "undead" enemies should respawn, such as the mummies being added later and the like...
Maybe you can add holy water throwables to the game or something like that to keep the undead dead for game play balancing. I don't know about this one though. Like I said "I hate to say it." People don't usually look forward to enemies respawning or getting back up lol.
The zombies can be a hassle as it is on the way back out. I'm happy no matter what you decide on this one. Take a player vote/ hold a poll if you're really unsure. It's never a bad idea to ask the players. Your game. Your call. You're the dev. I'm just here to supply ideas or spark new ones.
"I Hate being thoughtful sometimes, I really have to find a way to shorten the feedback more -_-... Thought I'd have a bit of fun with it anyway. Felt conversational. I'm sorry."
Seems like you have everything under control and know exactly where and what you want to do with it. I'll leave you to it. I look forward to playtesting it again in the future. It's always awesome when the dev listens to the players. Some of us actually know what we want XD. Crazy right? Just make sure to keep the list of things to do in each update manageable yeah?. No one likes to see a burnt out dev.
Obviously you don't have to respond to everything. This is here just so it was said for peace of mind.
From here on out I will try to keep the feedback separated by what it's about in separate posts to keep things tidy. Starting with the next question I have if it hasn't already been answered once I get back to the forums here. See you there hopefully.
"Like a book you can always keep writing but its good to have a fulfilling end at some point..."
"As always, just trying to help. Hope you enjoyed the read & don't mind."