Did someone say Metroidvanias? :D
https://kurogamedev.itch.io/mi-ni-mi-2
https://kurogamedev.itch.io/mi-ni-mi
https://kurogamedev.itch.io/infaustus-fortuna
https://kurogamedev.itch.io/the-tales-of-sir-regal
https://kurogamedev.itch.io/super-mini-jumper
The gameplay time of these games vary, but I can do these games within 30-90 minutes.