Thank you for playing!
Yes, certanly could introduce buttons... we wanted to keep them for hidden places and use levers for open places, but kind of run out of time and decided to stick with buttons... could try to make them bigger for visibility though, really.
Invisible walls did have something special to distinquish them from others. Once you will see it - you will have easy time locating the rest (except couple that are designed to be harder to find). Was planning to make them as accident discovery. Now to think about it - could use button in first room instead and keep walls as a secret hmm..
Combat was scrapped and replaced.. and it kind of shows. Couple of things stayed there as unintentional consiquences of switch :( Like move with instant attack.
Time... never enough time! :D