Thank you for the feedback. The fixes are listed below.
As always, enjoy!
[b]Changes since 1.0.0[/b]
[list]
[*]Fixed the S-Rank achievements. If you encountered this issue, you will have to replay one of the levels on any difficulty and acquire an S-Rank. You will properly unlock the achievement.
[*]Fixed a bug that made it possible to unlock ship upgrades at lower levels.
[*]Fixed texts with exotic symbols (like the °-sign) that didn't render on Mac/Linux.
[*]Changed the Desktop-icon (thank you [i]POOTERMAN[/i])
[/list]