After all these years, and growing up with Windows 3.1, I have seen an entire evolution of computers and software. Touch screens and large resolutions were a pipe dream just 15 years ago. Now it's the norm. Going from a Packard Bell (yes, before HP) that couldn't run 3D Ultra Mini...
Don't kill your Deadlings if you don't have to - they're pretty valuable.
Don't forget you can switch to different creatures on the fly. This is handy for switch pushing.
If there's an obstacle blocking your way, cut it out.