Very great game, played through it once or twice on V0.8.0 and gave it a try with the latest release V 0.9.0
I've found the changes to slimes make them significantly more difficult, annoyingly so. Even knowing about them ahead of time and setting up defenses wasn't enough, and it quickly reached a point where the hot air balloon looking ones would spawn baby slimes quicker than could be killed.
Not sure if it was the case in previous versions, but the sound effects for both the elevator moving and slimes dealing damage to structures are LOUD. I haven't changed the sound settings, and they're easily double or triple the loudness of other sound effects.
The increased energy transfer rate is quite noticeable and very welcome, as previously I'd need to spend quite awhile simply holding W to build things, which gets boring very quickly.
I'll have to give it another try later, as I only progressed right up before building the radio tower and didn't see what it does, but I'm looking forward to seeing the game move forward to completion!