Well, unfortunately there is not much more we can do at the moment. The latest message I posted on the subreddit explains the situation a bit. I'll copy paste the message here:
... I know this is not ideal but it has become impossible for us to keep updating the game. Not only it wasn't economically viable at all, but the technology we used to make the game is very inaccessible to use right now. The version of the engine is not getting updated and it barely runs on modern systems, and we don't really have the bandwidth to port it to a new engine.
The game in its current state is "finished". You can start a game, do everything you expect to do in a metroidvania, defeat the final boss and get to the credits screen. It is not 100% the version we had in mind and we would love to improve many aspects of the game, but it is just not possible for us to keep working on it. Is the game perfect? Of course not. Would it be nice to keep doing updates? Absolutely, but as sad as it seems, real life got in the way and I'm not sure when those updates will come.
I personally started porting the game to a new engine in my free time, but it is not even close to be playable and this is just a solo endeavor.
We are extremely grateful to all the people who supported us along the way and we always make sure to reply to any message we get. So if you want to keep asking questions we are available...
If you want a refund I'm happy to issue one, and I should probably close the store page. Sorry for the inconvenience 🙇♂️