Metal Slug Tactics Final Day

Accidentally beat the game. Restarted campaign to see what I missed on the other level.
Overall not much replay ability even with new characters unlocked. I would prefer to continue the upgrades on a further difficulty.
3:42 Area 3 - Mission 1
22:57 Area 3 - Mission 2
39:57 Area 3 - Final Boss?
1:19:31 Post Game?
1:24:35 Area 4 - Mission 1
1:56:17 Area 4 - Mission 2
2:14:22 Area 4 - Boss!