Thanks for your support, and feedback! That's an interesting suggestion. I had the chapters keeping track of total deaths because I thought it would be fun to know how many times you've died in that chapter. If I remember correctly, speedrun mode should count your deaths and diamonds as a fresh score, which would then be added to the chapter's total death score. I understand why it would be nice to see your best score on the main screen though. I'll consider that for a future update.