After quite some time, we've finally managed to lock the endless dungeon mode down to something we think is close to our original idea. It's still in development, of course, so we'll keep updating the beta branch with changes and fixes, until it works as expected.
In this first update we're introducing a new type of enemy (not yet in the codex): Heartless, a version of Heart which does not feel the same way towards Slash. They will be special enemies found regularly, with varied equipment.
We've also tweaked the length of sections and adjusted the difficulty. The number of enemies and their speed scales a little slower now, so a whole cycle is relatively achievable.
We've also fixed a couple of issues which might cause a room to remain shut after all enemies were defeated.
In future updates we intend to introduce a finished version of the Heartless challenge room, further tweak stuff and teach Dogbot how to climb a set of stairs. Translations will come at a later time. Heartless also needs to be a little easier, or appear in lower numbers, but we need to do further tests.
And, of course, if you find any issue, let us know. We'll create a thread in the forums, so you can report problems and propose ideas.