What are some alternatives?
When comparing Kid Chameleon and Hollow Knight, you can also consider the following products
Megaman Origins - Between MM3 and MM4 there was a MM adventure, never told, until now:
Super Meat Boy - Let's start with what's the same: Dr. Fetus is still a jerk, gameplay is super challenging but fair, there are tight controls and great levels and you will die. a lot.
Mega Man Revolution - A fan-made 8-bit-style Megaman side scrolling shooter game.
SuperTux - SuperTux is a classic 2D jump'n run sidescroller game in a style similar to the original Super...
Mega Man Rock Force - Megaman Rock Force is a fan-made game designed to mimic the look and feel of classic 8-bit Megaman...
Secret Maryo Chronicles - Secret Maryo Chronicles is an Open Source two-dimensional platform game and is using an Open Graphics Library for the best possible graphic design and stock performance.