Set in the fictional kingdom of Parts, players assume the role of children controlling a plane equipped with the titular propelling engine to overthrow the Metoruin sages and their new world order.

Initially envisioned as a vertical-scrolling shooter and intended to be their last game, Progear was created by CAVE as a collaboration with Capcom and served as their first horizontal-scrolling shooter title, with bullet dodging and enemy destruction being the main focus while adapting the company's shoot 'em up gameplay style in a horizontal format but faced a problematic development cycle before its launch to the market.

Among these elders who obtained immortality were Ballossum Pench, Gabriel Hammer, Jimchuck Spanner, Olsorro Slasher and Leonard Drill.

They later became known as the Motoruin sages, eventually attempting to take over the Parts kingdom and began a new world order, collapsing the government and destroying villages of the country in the process.

[6][15][16][17][18] The team decided to make bullet dodging and enemy destruction its main focus, while adapting the company's shoot 'em up gameplay style in a horizontal format but the project would go through a problematic development cycle until it was released.

[6][17][19][20][21] Both Ikeda and Inoue stated that working with the CP System II platform, which marked the second time CAVE made use of an external arcade board, proved to be difficult as the hardware was underpowered compared to the previous board used for Guwange, with designers using a limited number of colors to remake drawings created in Photoshop.

[37] Pete Brown of GameSpot noted it to be "a standout side-scrolling shooter with beautiful 2D graphics and a reasonable difficulty curve, the latter of which is somewhat rare for the genre".

[39] Carlos Leiva of Spanish website Vandal gave positive comments to the game's action, bosses, gameplay and original steampunk setting.

[4] Nintendo Life's Will Freeman regarded it as a standout shooter within the Capcom Arcade Stadium compilation due to its depth, visuals and replay value.

[45] Likewise, the title also served as influence for Jamestown: Legend of the Lost Colony, according to Final Form Games' Mike Ambrogi.

[46] Ring's Gambler plane with Chain's Alpha gunner appears as part of a Capcom-themed DLC for Dariusburst Chronicle Saviours.