Would be cool if the mines and electric mines and poison clouds would blow the invisible dudes' cover and make them visible again. Also, burning effect is hugely disappointing. Freeze is basically a guaranteed KO, crit causes a massive amount of damage, burn... Does a little bit. Doesn't even stop invisibility.
Hey yaykitties! Clicking the sound button (top right) once mutes music, twice mutes everything. Hope this helps!