Cave Story+ hits Steam today for Windows and Mac with Steamworks integration for achievements, the Nemesis Challenge (for show-offs) and "a bunch of other tiny little details that make it more awesome." More Steam-only surprises are planned for a free update coming next month, too. 

Get in while the getting's good. The price on Cave Story+ is set at $10, but there's a first-week 15 percent off sale that puts it at only $8.50. 

Hit the jump for a full feature list.

Cave Story+ Features:

- Windows and Mac support

- Steamworks support featuring tons of achievements

- Windowed/full-screen and filtered/unfiltered modes

- Upgraded “HD” graphics and Original (320x240) graphics and 

- Remastered music as well as the original soundtrack

- Mix-and-match new/old artwork and music!

- Seven new play modes (including Nemesis Challenge, Wind Fortress and more!)

- Over 20 epic boss battles through Mimiga Island

- 15 levels to explore in the vast world

- 10 unique weapons to find and upgrade

- USB controller compatibility

- Four unique endings

- Future content updates