This video includes the environmental obstacle: laser receptacles. These bad boys oscillate between on - which creates a wide field that damages anything in it - and off. Time your moves carefully!
Also, you can see the first enemy here: a Bomberman-inspired bomb-dropping robots. Bombs turn dark red and glow right before they explode. Chaining explosions can lead to interesting results!
Also, other than this world, I disabled the background parallax - it makes some people think the game is looking top-down, which is confusing.
Thanks for the great feedback so far!