Well that went better than expected!
Despite numerous engine bugs and a whole lot of lost sleep, Heartbound now works in GMS 2.3. For many of you this means that it now runs at 60fps with a VERY small CPU cost again. On my machine currently it's running at 1.4% CPU and around 150MB of memory.
Going forward this also gives us a ton of other rad things like Mac build coming back, console releases, etc. Stay tuned for that in the future.
That being said there is still a ton of work ahead of us to finish the full update. Right now, things work correctly for you but the environments on the editor side are a complete mess. We have to go through every room in the game and manually update it all. It's gonna be a bit and take a lot of long nights. Until then you may see weird layering issues in-game. Please report these to us so we can fix them!
Thankfully it's not difficult, just time consuming.
We will get there and have it done as soon as possible.