Finished playing Metal Slug XX on Steam earlier today.
The games are short but they are really fun and worth it for the price when it goes on sale.
There is replayability with multiple difficulties and the training mode is basically challenge mode with levels from the main game.
I just did the main story/campaign which takes an hour.
Game: Metal Slug XX
Genre: Shooter
Developer: SNK
Publisher: SNK
System: Steam (PC)
Year of Release: 2019
Length of Playthrough: 1 Hour
Total Score: 93/100
+7 Missions along with several challenges part of the training mode
-Very short
Score wise comparison sake...
Metal Slug (NGO): 82
Metal Slug (PC): 81
Metal Slug (PS4): 79
Metal Slug 2 (NGO): 88
Metal Slug 2 (PC): 88
Metal Slug 2 (PS4): 86
Metal Slug X (NGO): 90
Metal Slug X (PC): 90
Metal Slug X (PS4): 89
ACA NEOGEO Metal Slug X (Xbox Game Pass): 78
Metal Slug 3 (NGO): 92
Metal Slug 3 (PC): 92
Metal Slug 3 (PS4): 91
Metal Slug 3 (PSNow): 92
Metal Slug 4 (NGO): 91
Metal Slug 4 (PS4): 91
Metal Slug 5 (PS4): 92
Metal Slug 6 (PS4): 93
Metal Slug XX (PS4): 93
Metal Slug XX (PC): 93
Metal Slug Anthology (PS4): 94