The version 1.4 (build 64) fixes one bug and adds a few improvements:

• exploding ship’s blast wave makes it easier to recover from lost life by blasting stones away and even crushing some to bits with immense force
  
• tutorial missions start with a clear screen — all existing stones are vanquished by pressing “Accept mission”
• fixed a bug where a ticking sound continues after exiting game while having a bonus equipped
• wording of one tutorial mission is very slightly clearer
• delta character was added to the base font and used responsibly
• added another secret

Thanks everybody for playing and talking about the game!