Jazz Jackrabbit 2 Online

Quite like the gameplay. I'm still oddly fond of layouts with lots of vertical movement, and it's super easy to learn.
Visually, I love all the kooky gadgets in the walls, the Labrat-esque palette, the upside-down powerup, and the stop signs. However, I think the background's too austere – there's a cute textured background and a cute parallax layer matching the layout of the foreground, but that isn't quite enough for me to absorb an atmosphere from, and I'm left reading the level as mostly-disconnected floating platforms.
This minimal background decoration also results in a lack of visual cues for your position after jumping left off the top carrot platform, but I guess there's always the F9 display for that.