Bake cake in baking pan; cool in pan 10 minutes. Remove from pan and cool completely. Position on foil-wrapped cake board cut to fit.
Trim off top and engine detail from cake. Ice smooth using violet tube icing from icing kit.
Using round tip and orange tube icing from icing kit, pipe space man face. Pat smooth with finger dipped in cornstarch. Cut marshmallow in half. With cut sides down, attach to space man face. Pipe pupils and mouth with blue tube icing from icing kit. Attach mini candy-coated chocolates with icing.
Using star tip and yellow tube icing from icing kit, pipe star pattern on cake.
Cut spice drops in half. With cut sides down, attach to cake with icing. Cut large spice drops into slices to resemble flames. Attach to cake with violet tube icing from icing kit.