i had something similar happen with my roku / TV .... LG pushed out some sortof update that didnt work well with roku.. i had to connect to another TV memorize the key strokes to set the resolution to a lower resolution. It worked fine after that ... dont know if i ever increased the resolution again.
Possibly adjust resolution lower and see if that resolves the problem.
@ShinraPie I hadn't seen that game, no - it does look a lot like what I remember from Abe's Oddissey, nice.
All those games are free to get, yes. Here are some of the links where you'll find most of the games. Others that may be older you'd have to search for individually: