Ice width: 325 pixels
Ice height: 230 pixels
Enemy height: 109 pixels
I'll use Kirby's canon height for the enemy's height since Poppy Bros Jr. is normally around the same height as Kirby.
Kirby's canon height: 20 cm
325 / 109 = 2.9816513761467889908256880733945
230 / 109 = 2.110091743119266055045871559633
2.9816513761467889908256880733945 * 20 = 59.63302752293577981651376146789 cm
2.110091743119266055045871559633 * 20 = 42.20183486238532110091743119266 cm
Volume = 11800 cubic cm
Mass = volume * density
Density of ice = 0.92 g/cm^3
0.92 * 11800 = 10856 grams or 10.856 kilograms
The ice seems to spread 660 pixels.
660 / 109 = 6.0550458715596330275229357798165
6.0550458715596330275229357798165 * 20 = 121.10091743119266055045871559633 cm or 1.2110091743119266055045871559633 meters
The ice seems to appear in 1 frame. The video is 30 FPS.
1 / 30 = 0.03333333333333333333333333333333 seconds
1.2110091743119266055045871559633 / 0.03333333333333333333333333333333 = 36.330275229357798165137614678903 meters per second
Mach 0.10591916976489153257
Subsonic
KE = 1/2 mass * velocity^2
10.856(0.5) * 36.330275229357798165137614678903^2 = 7164.3569396515444827876441377004 Joules
Wall level
Rip, lmao.