While I'm not ditching the X-Treme formula, I'm moving toward Sonic Jam-type (or Project Condor) levels, so I don't want to spend too much time on creating "blocky" levels.
I'm slowly resuming work on Sonic Z-Treme, so sadly I have no idea when it will be ready, but I want to show my next version at SAGE 2018, so hopefully I'll have something nice to show by then.