Final Grading System - Explanation and Guide (by Lunacent)

An explanation to the grading system shown at the end of the game

The guide

Bat to the Heavens ending scoring system

Time score (based on savefile playtime in seconds):
10000001 or more : 0 points
57601 to 10000000 : 1 point
43201 to 57600 : 2 points
28801 to 43200 : 3 points
14401 to 28800 : 4 points
7201 to 14400 : 5 points
5401 to 7200: 6 points
3601 to 5400 : 7 points
3001 to 3600 : 8 points
2401 to 3000 : 9 points
1801 to 2400 : 10 points
1800 or less : 11 points
(these breakpoints correspond, in increasing order, to 30 minutes, 40 minutes, 50 minutes, 1 hour, 90 minutes, 2 hours, 4 hours, 8 hours, 12 hours, 16 hours, and ~2777 hours)

Death count score:
10000001 or more : 0 points
2001 to 10000000 : 1 point
1501 to 2000 : 2 points
1001 to 1500 : 3 points
501 to 1000 : 4 points
201 to 500 : 5 points
101 to 200 : 6 points
51 to 100 : 7 points
21 to 50 : 8 points
11 to 20 : 9 points
2 to 10 : 10 points
1 or less : 11 points


Completion score (based on the % shown on file select)
108 : 8 points
100.1 to 107.9 : 6 points
95.1 to 100 : 5 points
80.1 to 95 : 3 points
70.1 to 80 : 2 points
50.1 to 70 : 1 point
50 or less : 0 points
BONUS: +1 point to any tier if you disrupted all 5 hamsters in the power room and caused the game to reboot,

The three point values from all three categories are summed and produce the following grades:
0 - 2 points: D
3 - 6 points: C
7 - 10 points: B
11 - 14 points: A
15 - 16 points: S
17 points: SS
18 - 19 points: X
20-21 points: H
22-31 points: H+

Additionally, the splash art shown is independent of the grade you receive, and is determined based on the following conditions, from highest to lowest priority:
- Cleared with 0 deaths
- Have 108% completion
- Cleared in under 1 hour
- Fully completed the logbook (including receiving Butter's card)
- 80% or higher completion
- 30% or higher completion
- Default

This guide would have been written by Lunacent, but she said I could post it here and take all the credit so now I'm the one who wrote it.

[kana]

Thank you for creating this guide! It has been incredibly helpful for unlocking the "Pinnacle" achievement.

By the way, I recently completed the game in under 17 minutes with 11 deaths and a 25.4% completion rate.
Based on the tables in this guide, the score for this play is 20 points: 11 (≤ 30 minutes) + 9 (11–20 deaths) + 0 (≤ 50% completion).
This score should correspond to grade H (20–21 points), but the game displayed grade X instead: https://steamcommunity.com/sharedfiles/filedetails/?id=3407995743
Could it be that grade H requires at least 21 points, rather than 20 points?