Elf is a platform game which almost crosses into the adventure genre. You play an elf who is out to destroy Necrilous the Not-Very-Nice. It's resonably non-linear areas in that you can go back and forth between areas. You collect items during play and get access to different spells and attacks.
Reviews View More
A solid action platformer with decent visuals and a great soundtrack. Also did Undertale's morality thing a few decades before Undertale.