As someone who adores Cave Story, this is another great game of a similar type. If you have played Cave Story, it has a bit less plat forming and weapon options, but every weapon is useful and mastering them all is essential. The hard mode provides a decent challenge, but never too challenging that you feel frustrated. With a great soundtrack to boot, it is easily worth the price, especially if you want to help Pixel develop more games in the future.
Scrimmy Bingus about Kero Blaster