That's probably the longest comment I got so far! Thanks for a detailed feedback (And your other comments!)
There's no level 3 keycard in the game yet, or 2 for that matter. The thing you pick up as a slime is something else! It's a pendrive. It even has a use! Goo puddles are always visible, unless your monitor's color range is limited, which has been an issue and I am planning a solution that isn't just changing sprites.
Goo wolves are under a rework. A solution has been implemented and will be available in the next patch. It's a fun one, but I will keep it a secret for now.
Inanimate TFs are an extension of slime gameplay, so they aren't treated like other major TFs. At the same time, they aren't finished at all, just the Goo-Mat mechanic is implemented so far. Intended and emergent pooltoy softlocks are intended, as well as the scripted pig dronification outcomes. Blocking your path with goo leading to a type of emergent softlock is an intended feature. Also Goo-Mat along credits get sped up by 20% in next patch too! I don't plan any indicator for reaching these states for various reasons. Avoiding these states while retaining the fun bits of your form is the main gameplay element. More interactions are coming for existing creatures in the far future, including progression paths to certain softlocks.
The trap pooltoy room is intended to trap you regardless of your form unless you are lightweight slime. The spray is far in the demo, but it's meant to be early in the game as a whole. There will be more copies of this item in the future. Yes, you can use forms to bypass puzzles or to have different fun issues in them! The one major exception here is that enemies don't react to non-intended forms yet, at least not all of them. A few more combinations will be added to prevent cases where it would seem like they should interact but don't yet.
I hope I didn't miss anything!